Activities of M&R Claushuis B.V. From our own production of lead ingots we supply many shipyards in the Netherlands and surrounding countries with 'ballast made-to-measure'. The production of lead keels and other counter weights has expanded steeply as well. We are the largest mercury producer in Europe, and we produce mercury with a minimum purity of 99.9995%. Some of the metals we process are subject to the legislation on chemical waste. Naturally we hold all the licences required for the ...